Bobbin and method of producing the same



jane, 15 1924.,

RKV. SNYDER ET AL.

BOBBIN AND METHOD OF PRODUING THE SAME Filed June 25 1923 Imlllllll A TTORNEYJ1 Patented Jaa. 15, 1924.

PATENT OFFICE.

REX V. SNYDER, OF ST. LOUTS, MISSOURI, AND MALCOLM CURBY, OF SCARSDALE, NEW i YORK, ASSIGNORSIO THE AMERICAN THREAD COMPANY, OF NEW YORK, N. Y., .A

CORPORATION OF NEW J BOBBIN .AND METHOD 0F PRODUCING- THE SAME.

Application :tiled June 28, 1923. Serial No. $47,244.

To all -wlwm t may concern:

Be it known that we, REX V. SNYDEE and IVLMLGOLM QUERY,l citizens of the United States, residing at city of St. Louis, State of Missouri, and Scarsdale, county of VVestchester, State of New York, respectively, have invented a certain new and useful Improvement-in Bobbins and Methods of Producing the Same, of which the following is 1o a full, clear, and exact description.

Our invention relates to bobbins for sewing machine shuttles and to a method of producing the same, and has for its object the production of a novel and improved bobbin of this character.

The following is a description of our invention, reference being had to the accompanying drawing, in which- Fig. 1-is a longitudinal sectional View of 2e the component parts of our improved bobbin in its preferred form, with theparts shown separated, 'and aboutto be assembled in accordance with, our improved method;

Fig. 2 is a longitudinal sectional view of thc bobbin partially formed and also lillustrating by dotted lines certain devices that may be used in carrying out certain steps of the method;

Fig.y 3 is a longitudinalsectional view of the completed bobbin and also illustrating by dotted lines the operating instrumentalities of a cop press of a common construction that mayl be employed in performing the final step in my improved method; and

Fig. 4 is a View in perspective of the completed bobbin.

In the complete bobbin shown in Figs. 3 and 4 of the drawings, 2 is a tubular core on which is a cross-wound mass of thread 4. Fitted on the ends of the-core and making close contact with the ends of the mass are annular disks 6 of resilient paper. In the preferred form the outer portions of the disks tend to move toward the mass and 4f they are prevented by the mass from so moving, with the result that` a tension is maintained insuring a close contact between the disks and the outer portions of the end surfaces of the mass. The ends of the core :'H are upset so as to hold the disks in place.

rlhe mass is compressed preferabl so as to have its ends slightly rounded an so that its outer rtions are more dense than its inner port1ons and the disks tend to assume 'in place.

the rounded ends of the mass.

ln carrying out our improved methoda` tubular core 2 of paper or other swaging material is provided on which thread is cross-Wound sons to form a mass 4, the

ends of the core projecting a distance beyond the ends of the mass. Annular dishshaped disks 6 of resilient paper or sim.

ilar fibrousmaterial whose central aper- Itures are adapted to make a snug it on the preferably formed from flat stock by means of heated dies having the curvatures desired for the vtwo faces of the disks. The disks 6 are lcentrally brought against the outer peripheriesof the ends of the mass of thread and are forced a distance over the ends ofthe core, this operation preferably fiattening the disks somewhat without materially compressing the endsof the mass. The ends of the core project-ing beyond the disks are then swaged sufficiently to hold the disks This operation of appl ing the disks to the core may be performed7 by any suitable means such as by co-operating dies 10 vthat engage the outer faces of the disks, and the swaging of the ends of the core may be accomplished by means of riveting plungers 12 that Work through axial apertures in the dies 10.

- The bobbin thus partially formed is then subjected 'to an endwise pressure to press it into its final form. rlhe core is by such pressure reduced lengthwise and its 'ends swaged to permanently hold the disk in place. rlhe final pressing operation on the ends of the bobbin is such that the disks are somewhat flatter than before application to the core or their ini-tial or normal degree of'curvature is reduced so as to be under a certaindegree of tension and thus cause them to exert a yielding spring-pressure on the ends of the mass of thread. The

Afinal pressing, core reducing and end swagshaped to conform tothe desired curvature of the ends of the completed bobbin; this curvature being less than that of the separate disks 10 previousl to be a plied.

In the bobbin thus ormed, t e resilient tension of the disks, together with the tendency of the outer and most dense, portions of 'the thread mass to expand, results in the maintenance of a close contact between the disks and the outer portions of the ends of the mass, which prevents the thread from spilling over and from working down between the fianges of the bobbin and the ends of the mass of thread as it is being unwound. This close Contact, together with the small momentum due to the light weight of the bobbin and the consequent practical elimination of over-running when the sewing machine stops, practically eliminates the .danger of tangling the thread even when the bobbins are used without friction or drag sprin s, and make the use of such springs wit their annoyance, expense and loss v,of time unnecessary. Moreover, the bobbin. will fit with sufficient accuracy shuttles of several different styles or dimensions, small variations in the shuttles causing no practical interference with the actual workin conditions of the bobbin. The bobbin 1s so constructed as to hold a maximum amount of thread .for a shuttle of a given size, and as tension or drag springs may be eliminated, the bobbin itself can be made larger so as to fill the space that would be otherwise occupied by such springs.

As will be evident to those skilled in the art our invention permits of various modifications without departing from the spirit thereof or the scope of the appended claims.

What we claim is: f l

1. A filled bobbin having, in combination, a core having thread cross-wound thereon into a mass, and disks secured on the ends of the core in close contact with the ends of the mass and tending to assume a dishshaped form of a given curvature toward said mass but being restrained therefrom by the ends of themass so as to cause said disks to exert a yielding pressure thereon.

2. A filled bobbin having, in combination, a core having thread cross-wound thereon into a mass, and disks of resilient fibrous material secured on the ends of the core and constructed and arranged so as to exert a yielding pressure on the ends of the mass.

3. A filled bobbin having, in combination, a tubular core of fibrous material having thread cross-wound thereon into a mass, the ends? of the mass being rounded over,

. and dish-shaped disks of fibrous material closely enga/ging the rounded ends of the mass, the ends of the core being swaged so mareas as to ermanentl hold the disks on the core.

4. filled bob in having, in combination,.

a tubular core of fibrous material having thereon a cross-Wound mass of thread, the mass being rounded on its ends and increasing in density toward its periphery, and dish-shaped disks of fibrous material closely engaging the rounded ends of themass, the ends of the core being swaged so as to permanently hold the diskson the core.

5. The method of formin a filled bobbin which comprises cross-winding thread into a mass on a tubular core placing dishshaped annular disks on the ends of the core against the ends of the mass, swaging the ends of the core to hold the disks in place, applying pressure to the ends of the mass and disks when thus assembled, and further swinging the ends lof the core to hold the disks more firmly in place.

6. The method of forming a filled bobbin which comprises cross-winding thread into a mass on a tubular core, placin dishshaped annular disks on the ends of the core against the ends of the mass, swa 'ng the ends of the core so as to hold the isks in place, applying pressure to the ends of the mass and disks when thus assembled, y

and further swaging the ends of the core to hold the disks more firmly in place, the disks being made of resilient fibrous material and said pressing operation being such as to reduce the curvature of the disks so as to cause them to exert a yielding pressure on the ends of the mass after the completion of said pressin and swaging operations.

7. The metho of forming a filled bobbin which comprises cross-winding thread into a mass on a tubular core and forcing dishshaped annular disks over the ends of the core and against the ends'of the mass, and then compressing the mass and swaging the ends of the core to hold the disks in place, the

disks beingV made of resilient fibrous material and said compression operation being such as to reduce the curvature of the disks so as to cause them to exert a yielding pressure on the ends ofthe mass after the completion of said compressing and swaging operations.

8. The method of forming a filled bobbin l which comprises cross-winding thread into a mass on a tubular core, placing annular disks on the ends of the core against the ends of the mass, swaging the ends of the core to hold the disks in place, applying pressure to the ends of the mass and disks when thus assembled, and further swaging the ends of the core to hold the disks more firmly in place.

REX V. SNYDER. MALCOLM CURRY.

Certicate of `Correction.,

It is hereby certified that -in Letters Patent No. 1,481,243, granted January 15, 1924, upon the application of Rex V. Snyder, of St. Louis, Missouri, and Malcolm (-urry, of Scarsdale, New York, for an improvement in Bolo'bins and Methods o1 Producing the Same, errors appear .in the printed specification requiring 'eorrertion as follows: Page2, line "i, for the Word he read bevi/ng,- same page,

line. 82, claim 5, for the word swinging read sway/ing,- antl that the Said Letters Patent should be'read with these corrections therein that the same may Conform to the record of the case in the Patent Office. K

Signed and sealed this 1st day of April, A. D. 1924.

[SEAL] KARL FENNING,

. Acting 00m-Missionar of Patents. 

